Minor Visual Issue.
Change the name of a class... does not immediately affect the name of the class on the Design Area.
Select a class in the Designer - on the Design Area (not the Navigator)
ie: DIV - named "main-wrap"
Using the Navigator... locate the class and rename the class to "main-wrapper".
The change will appear immediately in the Navigator.
In the Design Area... it still says "main-wrap". Not "main-wrapper".
Until... you click into the Design Area.
When you do... it will change to "main-wrapper".